Membrane-bound carriers that form a redox chain carriers that move within the membrane soluble carriers.
What are carriers in membrane?Carrier proteins and channel proteins are the two primary categories of membrane transport proteins. The specific solute to be transported is bound by carrier proteins (also known as carriers, permeases, or transporters), which then go through a series of conformational changes to move the bound solute across the membrane.Through conformational changes that sequentially expose the solute-binding site on one end of the membrane and then onto the other, carrier proteins that bind specific solutes and transmit them across the lipid bilayer.Membrane bound transport:
Membrane transport is the term used to describe the movement of particles (solute).
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DNA sequence analysis shows that whales _____ A. have almost identical genomes. B. have less sequence homology between them than horses and cows. C. have a mutation in their limb genes that prevents them from producing limbs at all. D. have more sequence homology with each other than they do with other mammals.
DNA sequence analysis shows that whales have almost identical genomes A.
What is DNA sequence analysis ?DNA sequence analysis can be defined as the process of subjecting a DNA, RNA sequence to any of a wide range of analytical methods to understand its features or evolution. Sequences analysis from different organisms can be compared for evolutionary analysis between species, DNA sequencing can reveal changes in a gene that may cause a disease. One of the common type of DNA profiling today for criminal cases and other types of forensic uses is called "STR" (short tandem repeat) analysis.
Therefore DNA sequence analysis can be used to reveal changes in a gene that may cause a disease.
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Temperature regulation
Match the descriptions of temperature regulation with the correct term.
A. Depend on external heat sources to warm their bodies. ectotherms
B. Depend on own metabolically generated heat to warm their bodies. endotherms
C. Maintain body temperature within a narrow range. homeotherms
D. Body temperature varies with the environment. heterotherms
Mammals regulate their body temperature carefully and independently of their environment through a process called thermoregulation.
Does the body temperature of ectotherms fluctuate?Animals that often have a body temperature similar to their immediate environment are referred to as "ectotherms." They are unable to control their body temperature internally.
What four bodily functions regulate body temperature?Similar to how the respiratory, muscular, integumentary (skin and related components), and circulatory systems collaborate to support the body in maintaining a constant internal temperature.The skin's blood vessels expand in response to a rise in body temperature, allowing more blood to flow near the skin's surface.
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where would you find iron regulatory protein (irps)? group of answer choices cytosol nucleus mitochondria golgi apparatus
Similar to how iron is imported and transported within cells, mitochondrial iron import and transport are tightly controlled, careful processes intended to prevent undesired.
Which of these are hollow rods that help the cell form and are supported?The third main component of the cytoskeleton, microtubules, are hard, hollow rods with a diameter of around 25 nm. Microtubules are dynamic, constantly assembling and disassembling within the cell, much like actin filaments.
What form does the packaging and modification of proteins take?Figure 1: Proteins are modified and organized for transport within the cell by the Golgi apparatus. In cells, the Golgi apparatus and ER are frequently found together.
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Question 4 Which of the following would not lead to polycythemia? Iron deficiency Living in a high altitude Emphysema Excessive aerobic exercise
Iron deficiency is not the cause of polycythemia, rest all like living in a high altitude, emphysema and excessive aeerobic exercise are the cause of polycythemia.
An excess of red blood cells in the body is referred to as polycythemia. The additional cells make the blood thicker, which raises the risk of serious health problems like blood clots.
There are numerous potential causes of polycythemia, and each one can be treated differently. If at all possible, underlying problems must be treated in order to successfully cure polycythemia. Additionally, blood cell numbers must be decreased.
Obstructive sleep apnea, obesity hypoventilation syndrome, and chronic obstructive pulmonary disease are among the most frequent causes of secondary polycythemia (COPD). Heavy cigarette smoking and testosterone replacement therapy are additional reasons.
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Emphysema, living at a high altitude, and intense aerobic exercise are all factors that contribute to polycythemia, iron deficiency is not he cause.
Polycythemia is the medical term for an overabundance of red blood cells in the body. The extra cells thicken the blood, increasing the likelihood of significant health issues including blood clots.
Each of the many potential causes of polycythemia has a unique treatment option. To successfully treat polycythemia, underlying issues must be addressed, if at all possible. Reduced blood cell counts are also necessary.
Each of the many potential causes of polycythemia has a unique treatment option. To successfully treat polycythemia, underlying issues must be addressed, if at all possible. Reduced blood cell counts are also necessary.
The most common causes of secondary polycythemia include chronic obstructive pulmonary illness, obesity hypoventilation syndrome, and obstructive sleep apnea (COPD). Additional causes include testosterone replacement therapy and heavy cigarette smoking.
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TRUE/FALSE. he walls of lymphatic capillaries are composed of endothelium. lymphatic capillaries are highly permeable. fluid flows in one direction in lymphatic capillaries. lymphatic capillaries are dead-end tubes.
The walls of lymphatic capillaries are composed of endothelium. lymphatic capillaries are highly permeable. fluid flows in one direction in lymphatic capillaries. lymphatic capillaries are dead-end tubes.
TRUE
What is lymphatic capillaries?
Lymphatic capillaries (CAP-uh-lair-eez), also called lymphatic capillaries, are small blood vessels found throughout the body. A capillary is a small tube with an inner diameter as thin as a hair.
Lymphatic capillaries are similar to capillaries, but larger in diameter and closed at both ends. Unlike capillaries, fluid in lymphatic capillaries can flow, but cannot drain through the cell wall. It can only move forward.
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Which of the following processes correctly describes alternative RNA splicing?
It can allow the production of similar proteins from different RNAs.
It is a mechanism for increasing the rate of translation.
It increases the rate of transcription.
It can allow the production of proteins of different sizes and functions from a single mRNA.
Answer: D
Explanation:
The processes that may facilitate the synthesis of proteins of diverse sizes and functions from a single mRNA accurately define alternative RNA splicing, hence option D is correct.
What is RNA splicing?An RNA subtype that is found in cells, mRNA molecules, which carry genetic material, is necessary for protein synthesis. They move data from the nucleus of the cell to the cytoplasm, where proteins are made.
Because alternative splicing causes several forms of mRNA to be produced from a single pre-mRNA.
Throughout this process, exons are connected in a variety of ways, creating a vast range of mRNA combinations. This process produces a variety of proteins from a single pre-mRNA as a consequence.
Therefore, facilitating the synthesis of proteins of diverse sizes and functions from a single mRNA accurately defines alternative RNA splicing, hence option D is correct.
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Skeletal muscle tissue is found near the bones of the skeleton. These muscles are controlled by the nervous system and allow movement to occur. Smooth muscle tissue is predominantly found in the inner lining of many organs, such as the stomach and intestinal tract. Smooth muscle tissue allows organs to contract on their own. Cardiac muscle tissue is found in the heart. Cardiac muscle also contracts on its own, and it helps the heart beat properly. This information shows that.
Parts of living organisms are organized by their function is the function of Cardiac muscle also contracts on its own, and it helps the heart beat properly.
Myocardium, the middle layer of the heart, is made of cardiac muscle.. The main component of the heart is cardiac muscle tissue, or myocardium. The heart wall is composed of three layers: the inner endocardium, the outer epicardium, and a substantial layer of myocardium (also known as the visceral pericardium).
Adults should have a heart rate between 60 and 100 beats per minute while at rest. An efficient heart and higher cardiovascular fitness are often indicated by a lower resting heart rate. An athlete who has received proper training, for instance, can have a typical resting heart rate closer to 40 beats per minute.
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A nurse is preparing to suction a client's tracheostomy tube. Which of the following actions should the nurse plan to take? a. Apply intermittent suction during catheter insertion b. Suction the client's airway for 20 seconds with each pass c. Hyperoxygenate the client manually for 30 to 60 seconds before suctioning d. decrease suction pressure to 150 mmHg if the O2 sat levels drop during suctioning
The best action for a well trained nurse to take when preparing to suction a client's tracheostomy tube is:
Apply intermittent suction during catheter insertion.
The correct answer choice is option a.
What is meant by tracheostomy?Tracheostomy simply refers to a surgical procedure involving the opening of a hole in the trachea in order to provide alternative airways for gaseous exchange. This goes to say that, when a patient has a difficulty in breathing, tracheostomy is done to create an opening in the windpipe to allow easy flow of exchange of gases between the patient and his/her environment.
That being said, for this process to be successfully done by the healthcare provider, it is important that intermittent suction is well applied during catheter insertion.
In conclusion, it can therefore be deduced that the windpipe can be manipulated in certain health conditions.
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The K-selection reproductive strategy maximizes the survival of offspring by producing
a. few offspring with high levels of parental care
b. few offspring with low levels of parental care
c. many offspring with high levels of parental care
d. many offspring with low levels of parental care
The survival of offspring by producing few offspring with low levels of parental care.
Is it paternal or parental?Family law is complex, and it's important to understand the distinction between parental rights and paternal rights. Simply put, paternity is the determination of a child's father, while parental rights are given to the legal parents of the child.
Why is parental important in human?The importance of parenting arises from its role as a buffer against adversity (such as poverty or delinquent influences) or mediator of damage (as in child abuse). Parenting usually involves biological parents but is not confined to them. Carers, teachers, nurses, and others fulfil parenting tasks with children.
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transduction refers to conversion of
Answer:
one form of energy into another
Explanation:
The 150-million-year-old Archaeopteryx has many characteristics associated with birds, such as feathered wings. It also has characteristics associated with living reptiles. Which of the following characteristics is present in both Archaeopteryx and most living reptiles?wings supported by elongated fourth digitsclaws on the ends of each digit and a long bony tailthe presence of a beak with no teethlarge size and the ability to fly
The characteristics common to living reptiles and Archaeopteryx are: Long, bony tail and claws on the ends of each digit.
Archaeopteryx is the extinct species that belonged to the genus of bird-like dinosaurs. It is also known by the name Urvogel. Some of its characteristics are: a set of teeth, long bony tail, flat sternum, three claws on the wings, etc.
Claws are the arched narrow structures that emerge out from the digit of birds and reptiles. Claws are useful in the catching, holding and eating of food. They can also be used as protection from the enemies. Birds also used them for walking, perching, and swimming.
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Which of the following is incorrect pertaining to the arch of the aorta?
a. It begins and ends at the same transverse level.
b. It passes over the root of the left lung.
c. The ligamentum arteriosum connects to the superior aspect of the arch at its most superior point.
d. It gives rise to the left common carotid artery posterior to the manubrium.
e. It may give rise to an artery that directly supplies the thyroid gland.
At the arch's highest point, the ligamentum arteriosum attaches to the superior side of the arch. From the left pulmonary artery's root to the aorta's inferior arch surface, the ligamentum arteriosum travels.
Option C is accurate.
The aortic arch has which of the following branches?The brachiocephalic artery, rather than being a direct branch of the aorta, gives rise to the right subclavian artery (which branches from the arch of the aorta).
What exactly is the aorta's arched portion?By way of the brachiocephalic trunk, left common carotid, and left subclavian artery, the aortic arch, a portion of the aorta, aids in supplying blood to the head and upper extremities.
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Anaerobic conditions will most likely be generated in a natural water system with?.
Anaerobic situations will maximum possibly be generated in a herbal water gadget with low degrees of dissolved oxygen (DO) this is infected through pollution with excessive biochemical oxygen demand (BOD) values.
The required details for Anaerobic conditions in given paragraph
Anaerobic situations arise while the uptake or disappearance of oxygen is extra than its manufacturing through photosynthesis or diffusion through bodily shipping from the encompassing surroundings. Oxygen is typically fed on through microbial respiratory on account of the provision of natural material. Two examples of obligate anaerobes are Clostridium botulinum and the bacteria which stay close to hydrothermal vents at the deep-sea ocean floor. Aerotolerant organisms, which can't use oxygen for growth, however tolerate its presence. Facultative anaerobes, which could develop with out oxygen however use oxygen if it's miles present.
Most anaerobes require an surroundings with a low oxidation-discount potential (Eh gradient), which may be finished in affiliation with low pH, tissue destruction, byproducts from cardio bacterial metabolism, or low oxygen content.
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how are art and conservation science connected in this sculpture?
Answer: the artist was repurposing materials to create a variety of different masterpieces
The function of the "ciliary escalator" is to
Remove microorganisms from the upper respiratory tract.
Remove microorganisms from body cavities.
Kill microorganisms.
Remove microosganisms from the lower respiratory tract.
Transport immune system cells through the body
The function of the "ciliary escalator" is to Remove microorganisms from the upper respiratory tract.
What influences the mucociliary escalator?
Effective mucociliary clearance relies upon on a variety of things including the numbers of cilia, and their shape specially their height, and the first-rate of the mucus produced those desires to be maintained at an accurate humidity, temperature, and acidity.
What occurs if ciliary muscle mass is weakened?
Reason for disorder of presbyopia is slow weakening of ciliary muscle mass which decreases the power of the attention lens and the capacity of eye lens to cognizance on close to via way of means of in addition to a long way off items is reduced.
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the specific tonicity in which an animal cell will shrink or shrivel would be a cell in a hypertonic solution.
Plasmolysis, a process that causes cells to shrink and die when they are immersed in a hypertonic solution. Any external solution with the same solute concentration and water concentration as bodily fluids is said to be isotonic. There won't be any net water flow in an isotonic solution.
Eukaryotic plant cells are made up of specialized cellular organelles and differ fundamentally from animal cells in a number of ways. Typically, plant cells have a thick cell wall to hold them upright and keep them from losing their form. The cytoplasm, plasma membrane, and all other cell organelles work together to maintain the plant's activity. The water in the plant cell is kept in the vacuoles, an organelle with a membrane enclosing fluid. Under certain circumstances, plant cells either do not receive enough water or experience a significant loss of water. This causes the plant cell to completely contract, and the phenomenon is known as plasmolysis.
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Fault trees are an approach to hazard analysis that, for each identified hazard, break down that hazard to find how that hazard can occur.The hazard is placed at the root of the tree and the causes of the hazard are identified; Each of these causes is then further broken down and analysed until the fundamental software or hardware behavior that leads to these causes is identified.
Hazards are placed at the root of the tree and determining the cause of the hazard is the correct option for the following hazard analysis questions.
Fault Tree Analysis (FTA) explores how selected “top” faults (abnormal conditions) or fault events such as accidental/unwanted releases of hazardous materials can be resolved to their causes. Hazard analysis is defined as the process of gathering and interpreting information about the hazards and conditions leading to their existence in order to determine what is food safety related and must be addressed in the HACCP plan. Hazard analysis is used as the first step in the risk assessment process. The result of hazard analysis is the identification of different types of hazards. A hazard is a potential condition that may or may not exist.
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catabolic pathways _____.
include converting complicated molecules into smaller ones through a process known as degradation.
What is the catabolic route used for?Nutrient molecules are broken down into useable forms by catabolic pathways (Food: A, B, C) (building blocks).In the this process, energy would either be released as heat or is stored into usable energy for later use.
What sort of catabolic route is that?The breakdown of food by several enzymes so it can be taken by small bowel is an illustration of a catabolic response.
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What type of mutation has occurred in the following example?
A.) frameshift mutation (due to deletion)
B.) nonsense mutation
C.) silent mutation
Use screenshot to answer. Which letter choice is correct? A, B, or C? Thank you
the type of mutation is frameshift mutation. Thus option A is correct.
what is frameshift mutation ?
A frameshift mutation is defined as the process of insertion or deletion of nucleotide base which are not multiples of three.
This is important type of mutation because a cell reads a gene's code in groups of three bases when making a protein.
It is caused by the addition or deletion of one or more base pairs in the DNA of a gene resulting in the translation in an unnatural reading frame from the position of the mutation to the end of the gene.
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Which of the following does not achieve sterilization?
Dry heat
Ethylene oxide
Formaldehyde
Autoclave
Pasteurization
Answer:
Pasteurization
Explanation:
Answer: The correct answer is Pasteurization
Explanation:
Pasteurization does not achieve sterilization because sterilization eliminates ALL microorganisms and spores, whereas after the pasteurization process the most resistant spores remain present.
plant material (leaves, stems, trunks) in oxygen-poor swamps are buried for a geologically long time. the result is
Plant material (leaves, stems, trunks) in oxygen-poor swamps are buried for a geologically long time. the result is Coal.
Coal is a combustible black or brownish-black sedimentary rock that forms in the form of rock strata known as coal seams. Coal is primarily composed of carbon, with trace amounts of other elements such as hydrogen, sulfur, oxygen, and nitrogen.
Coal is mostly made up of carbon and hydrocarbons, both of which contain energy that can be released during combustion (burning). Coal is the most abundant fossil fuel in the United States and the world's largest source of energy for generating electricity. The remains of ancient organisms are used to create fossil fuels.
Coal-fired power plants provide affordable, dependable, and consistent power on demand to meet energy consumption needs. Because much of the world lacks access to modern, clean energy, coal remains critical to alleviating global energy poverty.
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When you compare the ages of items J-N, what principle(s) do you use so that you know what order to put them in?
Group of answer choices
Original Horizontality
Superposition
Cross cutting
Faunal sucession
Inclusion
When we evaluate the a long time of objects J-N, superposition principle(s) we use so you recognize what order to place them in.
The required details for law of superposition in given paragraph
The regulation of superposition is an axiom that paperwork one of the bases of the sciences of geology, archaeology, and different fields relating geological stratigraphy. In its plainest shape, it states that during undeformed stratigraphic sequences, the oldest strata will lie at the lowest of the sequence, at the same time as more moderen fabric stacks upon the floor to shape new deposits over time. This is paramount to stratigraphic dating, which calls for a fixed of assumptions, along with that the regulation of superposition holds authentic and that an item can't be older than the substances of which it's miles composed. To illustrate the realistic programs of superposition in medical inquiry, sedimentary rock that has now no longer been deformed with the aid of using extra than 90° will showcase the oldest layers on the lowest, for that reason enabling paleontologists and paleobotanists to pick out the relative a long time of any fossils determined in the strata, with the stays of the maximum archaic lifeforms restrained to the lowest.
These findings can tell the network at the fossil file overlaying the applicable strata, to decide which species coexisted temporally and which species existed successively in possibly an evolutionarily or phylogenetically applicable way.
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which symbol depicts an oxidizing reagent?
An oxidizing agent is usually denoted by the letters "ox" or "oxide". In chemical equations, this symbol is often used to denote substances or conditions that act as oxidizing agents and accept electrons from other species during redox reactions.
A chemical that aids in oxidation by taking electrons from another species is known as an oxidizing reagent (or oxidizing agent). The term "oxidation" describes a process when a substance loses electrons, increases its oxidation state, or experiences a chemical change where electrons are transferred to a different species. Typically, oxidizing agents are chemicals that are reduced during the process. They have a tendency to take up electrons, whatever causes them to take up electrons and become oxidized.
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classify the effector muscle involved in the response to the stretch reflex being tested by clicking and dragging the labels to the correct location.
Patellar reflex: Quadriceps femoris, Calcaneal reflex: Gastrocnemius and Soleus, Biceps reflex: Biceps brachii, Triceps reflex: Triceps brachii, Plantar reflex: Gastrocnemius, Soleus and Flexor digitorum longus.
A reflex is an uncontrollable movement that happens very instantly in reaction to stimuli. The reflex, which happens through a reflex arc, is an involuntary reaction to a stimulus that doesn't require or receive conscious cognition. Before an impulse reaches the brain, reflex arcs respond to it. examines descending motor pathways, motor nerves, synaptic connections in the spinal cord, and afferent nerves. Reflexes are suppressed by lower motor neuron lesions (such as those that damage the anterior horn cell, spinal root, or peripheral nerve) and are increased by upper motor neuron lesions. The amount of CNS damage may be determined by stimulating the abdominal reflex, which is done by massaging the belly.
The complete question is:
Classify the effector muscle involved in the response to the stretch reflex being tested by clicking and dragging the labels to the correct location.
(A). Patellar reflex:
(B). Calcaneal reflex:
(C). Biceps reflex:
(D). Triceps reflex:
(E). Plantar reflex:
The options are Quadriceps femoris, Soleus, Biceps brachii, Triceps brachii, Gastrocnemius, Soleus, and Flexor digitorum longus.
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TRUE/FALSE. when testing waterways for contamination with fecal matter which pathogen is often used as an indicator species
When testing waterways for contamination with fecal matter E.coli is often used as an indicator species.
Define pathogen.
Virulence, the degree to which the disease symptoms are severe, is used to describe a pathogen, which is an organism that causes disease in its host. Viruses, bacteria, unicellular and multicellular eukaryotes, as well as other taxonomically varied organisms, make up the diverse group of organisms known as pathogens.
Bacteria known as Escherichia coli, or simply E. coli, are present in the environment, food, and intestines of both humans and animals. There are many different types of E. coli bacterium. While the majority of E. coli strains are not harmful, there are those that can. Some strains of E. coli can cause diarrhea, while others can cause pneumonia, respiratory disorders like flu, and urinary tract infections, among other illnesses.
Stool from people and animals can contaminate groundwater and surface water, including streams, rivers, lakes, and water used for crop irrigation. Even though municipal water supplies use ozone, UV light, or chlorine to kill E. coli, certain E. coli outbreaks have been connected to tainted water supplies.
Private water wells are more of a worry because many of them lack a means of water sanitization. The likelihood of polluted water is highest in rural areas. Some people have contracted E. coli after swimming in lakes or pools that were tainted with feces.
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in a genetics experiment, a fruit fly heterozygous for long wings and a gray body is crossed with a vestigial winged, black bodied fruit fly
Long wings (L) are dominant, vestigial wings (L) are recessive, gray bodies (G) are dominant, and ebony bodies (G) are recessive in fruit flies. Two long-winged, gray-bodied fruit flies were mating. These two parental flies have the genotype LlGg LlGg.
This suggests that the parent fly with the grey, short wings is heterozygous for body color and the parent fly with the black, large wings is heterozygous for wing length. As a result, the long-winged fly with black genotype is ggLl whereas the genotype of the grey, short-wing parent is Ggll.
Because these genes are connected, the offspring of two heterozygous gray-bodied, normal-winged flies should be 50% gray-bodied/normal wings (BbRr) and 50% black-bodied/vestigal wings (bbrr).
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Roger is a forensic investigator. His examination of a dead body reveals that the body is completely limp. Which state is the body in?.
Roger works as a forensic detective. He examines a dead body and finds it to be utterly limp. The body is in a fundamental state of primary flaccidity. There are several phases of bodily decomposition, and distinct life cycles of insects—or insects—are discovered at various stages of the deceased body's deterioration.
primary flaccidity, When protein fermentation occurs within the body, cheese skippers, or Piophilidae, are discovered on the stage. Since these insects are not interested in the body while it is new, we can say that this is an advanced stage. primary flaccidity these insects often emerge after discovered protein is fermenting, therefore we may call this a later stage. (Asset A)
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A researcher discovers a fossil of what appears to be one of the oldest-known multicellular organisms. The researchers could estimate the age of this fossil based on
a) the amount of carbon-14 in the fossil.
b) the amount of uranium-238 in the fossil.
c) the amount of carbon-14 in the sedimentary rocks in which the fossil was found.
d) he amount of uranium-238 in volcanic layers surrounding the fossil.
e) the amount of uranium-238 in the sedimentary rocks in which the fossil was found.
The researchers could estimate the age of this fossil based on the amount of uranium-238 in volcanic layers surrounding the fossil. Option D.
When the age of a stratum or a fossil in a stratum is relatively old, the oldest is displayed at the bottom, meaning that the oldest is at the bottom and the newest is at the top. Imagine building a brick wall. The bricks placed first are the ones on the bottom which are older than the ones on the top of the wall.
The presence of ribozymes suggests that early cells may have used RNA to catalyze chemical reactions and transmit information. They exist as individual bacteria but are most often represented as stromatolites artificial rocks made from the waste products of cyanobacteria. The earliest accepted fossils are from Pilbara Western Australia. It's from Sterry Pool in the area.
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miriadel has been diagnosed with bulimia nervosa. which of these is a key characteristic of their eating disorder?
As miriadel has been diagnosed with bulimia nervosa that is a key characteristic of their eating disorder is that you either eat a lot or not.
Repeated episodes of ingesting abnormally massive quantities of meals in a single sitting. Feeling a lack of manipulate in the course of bingeing — such as you can not forestall ingesting or can not manipulate what you eat. Forcing your self to vomit or workout an excessive amount of to hold from gaining weight after bingeing.
The man or woman frequently engages in both self-precipitated vomiting, use of laxatives or diuretics, strict weight-reduction plan or fasting, or lively workout to save you weight gain. 4. A minimal common of binge-ingesting episodes every week for at the least three months.
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for cross-bridge cycling to occur, which of the following must be present in the sarcoplasm? check all that apply.
For the cross-bridge cycle to occur, calcium must be present in the sarcoplasm.
The cross-bridge cycle is the basis for movement and force production in muscle cells. Each cycle of myosin binds to actin and the movement of the thin filaments involves the hydrolysis of one ATP molecule.
To activate muscle contraction, tropomyosin must change its shape, exposing myosin binding sites on the actin molecule and allowing the formation of cross bridges. This can only occur in the presence of calcium, which is stored in very low concentrations in the sarcoplasm.
Bridges cannot cross-form without calcium because calcium allows the active sites to be exposed and without exposed active sites, bridges cannot form.
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